喷嘴释放单气泡的声发射特性

王鑫1 李美慧1 李晓磊1 杨转1 何利民1

(1.中国石油大学 (华东) 储运系山东省油气储运安全省级重点实验室, 山东青岛 266580)

【摘要】利用声发射技术在单气泡发生实验装置中研究了气液两相流中单气泡的动力学特性, 使用自行开发的采集处理程序进行气泡声信号的参数提取, 采用统计分析、小波变换和快速傅里叶变换对声信号进行时域和频域范围的分析。分析结果表明, 声发射技术可以检测到管内气泡的声信号, 具有较高的信噪比, 且声信号随着喷嘴尺寸的增大而增大, 随着液相表面张力的减小而减小。比较不同喷嘴直径下气泡的频率谱, 发现喷嘴释放气泡发出的声信号频率为150~200 k Hz, 且随着喷嘴直径的增大, 峰值频率相应增大, 提出了声信号峰值频率与气泡尺寸之间的关联式。同时得到了气泡上升过程中的连续形态变化, 分析了气泡产生声音的机理。研究表明, 声发射技术是一种灵敏度高、测量手段方便的方法, 可用于气液两相流气泡运动特性的检测。

【关键词】 气液两相流; 气泡; 测量; 声发射;

【DOI】

【基金资助】 国家自然科学基金项目 (51376197) supported by the National Natural Science Foundation of China (51376197)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 68, No. 05, Pages 1794-1802

May 2017

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Article Outline

摘要

  • 引言
  • 1 气泡产生机理
  • 2 实验装置与测量方法
  • 3 实验结果与分析
  • 4 结论
  • 符号说明
  • 参考文献